On 4/16/08, Anthony Liguori <[EMAIL PROTECTED]> wrote: > This patch introduces a DMA API and plumbs support through the DMA layer. We > use a mostly opaque structure, IOVector to represent a scatter/gather list of > physical memory. Associated with each IOVector is a read/write function and > an opaque pointer. This allows arbitrary transformation/mapping of the > data while providing an easy mechanism to short-cut the zero-copy case > in the block/net backends.
This looks much better also for Sparc uses. I converted pcnet to use the IOVectors (see patch), it does not work yet but looks doable. IMHO the read/write functions should be a property of the bus so that they are hidden from the device, for pcnet it does not matter as we have to do the swapping anyway.
pcnet_dma_api.diff
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